chummy - definition and synonyms

adjective informal old-fashioned 

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/ˈtʃʌmi/
adjectivechummy
comparativechummier
superlativechummiest
  1. chummy people are friendly with each other, especially in a way that stops other people from joining the group
    get chummy with someone (=become very friendly with someone):

    I can’t see him getting chummy with Bill – they have absolutely nothing in common.